/Engine/Source/Runtime/Core/Public/Algo/StableSort.h
Sort elements using user defined projection and predicate classes. The sort is stable, meaning that the ordering of equal items is preserved. This is the internal sorting function used by theAlgo::Sortoverloads.
namespace AlgoImpl { template<typename T, typename ProjectionType, typename PredicateType> void AlgoImpl::StableSortInternal ( T * First, int32 Num, ProjectionType Projection, PredicateType Predicate ) }